I've made a program that goes through your download directory (or any other directory you just have to change the path) and finds the files that matches your query then asks you to rename or remove the file of your choice. here is the working code :

I've made a program that goes through your download directory (or any other directory; you just have to change the path) and finds the files that matches your query then asks you to rename or remove the file of your choice.

I'd like to know how to make my program shorter.

#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#define SIZE 100
void nEraser(char expression[]);
void cases(char entery[] ,int ans ,int ansN);
 
int main(void)
{
     //DECLARATIONS
    //----------------------------------------------------------------------------------------------
    char fileNameContainer[SIZE] , entery[SIZE] , ans[3] , ansN[3] , *chrRes = NULL , fileNum[SIZE];
    int i , finderChecker = 0 , lenght = 0 , n = 0 , number = 1 , ansNInt =0 , fileNumInt = 0  ;
    DIR* directory = NULL;
    struct dirent* theFile = NULL;
    //----------------------------------------------------------------------------------------------
    do
    {
        /*these files need to be reinitialized after each 'y' answer*/
        /*-----------------------------------------------------------------------------------*/
        number = 1;
        ansNInt = 0;
        finderChecker=0;
        n=0;
        ans[3]="";
        ansN[3] = "";
        fileNameContainer[SIZE]= "";
        fileNum[SIZE] = "";
        /*-----------------------------------------------------------------------------------*/
        directory = opendir("C:\\Users\\USER\\Downloads\\");//opening the targeted folder
        if(directory == NULL)//always good to check
        {
            printf("error while trying to open this directory");
            exit(-1);
        }
        do
        {
            printf("enter the name of the file you want to look for : ");
            fgets(entery , sizeof(entery) , stdin);
        /*the fgets function prints in addition to the carateres needed the \n which is a pain
        in the ass so the following function removes the extra \n*/
            nEraser(entery);
            lenght = (int)strlen(entery);
            if(lenght < 3)
            {
                printf("please enter a name that contains more than 3 caracters \n");
                n++;
            }
            if(n == 5)
            {
                printf("you don't want to enter a valid name ? bye then ");
                exit(1);
            }
        }
        while(lenght < 3);
 
        while((theFile = readdir(directory)) != NULL)//reading the fileNameContainer while there is something to read
        {
            strcpy(fileNameContainer,theFile->d_name);//copy the fileNameContainer name to fileNameContainer because its easier to deal with
            /*changing the name of the file to lower case so that it maches the name entered by the user*/
            for(i=0 ; fileNameContainer[i] != '\0' ; i++)
                fileNameContainer[i] = tolower(fileNameContainer[i]);
            /*this is where all the magic happens*/
            if((chrRes = strstr(fileNameContainer,entery)) != NULL)
            {
                printf("%d- \" %s \"\n", number , fileNameContainer);
                finderChecker++;
                number++;
            }
        }
        /*in case there is a match*/
        if(finderChecker != 0)
        {
            printf("\n%d results in total\n\n" , finderChecker);
            printf("what file do you want to modify , choose a number : ");
            fgets(fileNum , sizeof(fileNum) , stdin);
            nEraser(fileNum);
            fileNumInt = strtol(fileNum , NULL , 10);
            printf("what do you want to do with this files ?\n");
            printf("1.rename\n2.remove\n3.nothing I just want to get the hell out of here\n");
            fgets(ansN , sizeof(ansN) , stdin);
            nEraser(ansN);
            ansNInt = strtol(ansN , NULL , 10);
            cases(entery , ansNInt , fileNumInt);
            printf("would you like to perform another search ? y/n ");
            fgets(ans , sizeof(ans) , stdin);
            nEraser(ans);
            if(strcmp(ans,"n") == 0 || strcmp(ans,"N") == 0)
                break;
        }
        else
        {
            printf("we were unable to find this file , would you like to make another search ? y/n ");
            fgets(ans , sizeof(ans) , stdin);
            nEraser(ans);
        }
 
        if(closedir(directory) == -1)
            exit(-2);
    }
    while(strcmp(ans,"y") == 0 || strcmp(ans,"Y") == 0);
    getchar();
    return 0;
}
 
void nEraser(char expression[])
{
    int i , lenght = strlen(expression);
    for(i=0 ; i<lenght ; i++)
    {
        if(expression[i] == '\n')
            expression[i] = '\0';
    }
}
void cases(char entery[] ,int ans , int ansN)
{
    //---------------------------------------------------------------------------------------------------------------------------------
    int i , number = 0;
    struct dirent* filename = NULL;
    DIR* directory = NULL;
    char  *chrRes = NULL , fileNameContainer[SIZE] , Path[SIZE] = "C:\\Users\\USER\\Downloads\\" , newFileName[SIZE] , removeAns[3];
    //---------------------------------------------------------------------------------------------------------------------------------
    directory = opendir(Path);
        if(directory == NULL)//always good to check
        {
            printf("error while trying to open this directory");
            exit(-1);
        }
        while((filename = readdir(directory)) != NULL)//reading the fileNameContainer while there is something to read
        {
            strcpy(fileNameContainer , filename->d_name);//copy the fileNameContainer name to fileNameContainer because its easier to deal with
            for(i=0 ; fileNameContainer[i] != '\0' ; i++)      
                fileNameContainer[i] = tolower(fileNameContainer[i]);
            chrRes = strstr(fileNameContainer,entery);
            if(chrRes != NULL)
            {
                number++;
            }
            if(number == ansN)
                break;
        }
    switch(ans)
    {
        case 1:
            printf("what's the new file name ? : ");
            fgets(newFileName , sizeof(newFileName) , stdin);
            nEraser(newFileName);
            strcat(Path , filename->d_name);
            if(rename(Path, newFileName) == 0)
                printf("the file %s (PATH : %s )was renamed successfuly , the new name is : %s\n" , filename->d_name , Path , newFileName);
            else
                printf("the renaming process didn't go well ...\n");
            break;
        case 2:
            printf("are you sure you want to remove the file : %s ? y/n \n" , filename->d_name);
            fgets(removeAns , sizeof(removeAns) , stdin);
            nEraser(removeAns);
            if(strcmp(removeAns , "y") == 0 || strcmp(removeAns , "Y") == 0)
            {
                strcat(Path , filename->d_name);
                remove(Path);
            }
            break;
        case 3:
            break;
        default :
            printf("please enter a valid answer");
    }
    if(closedir(directory) == -1)
        exit(-3);
}

#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#define SIZE 100
void nEraser(char expression[]);
void cases(char entery[] ,int ans ,int ansN);
 
int main(void)
{
     //DECLARATIONS
    //----------------------------------------------------------------------------------------------
    char fileNameContainer[SIZE] , entery[SIZE] , ans[3] , ansN[3] , *chrRes = NULL , fileNum[SIZE];
    int i , finderChecker = 0 , lenght = 0 , n = 0 , number = 1 , ansNInt =0 , fileNumInt = 0  ;
    DIR* directory = NULL;
    struct dirent* theFile = NULL;
    //----------------------------------------------------------------------------------------------
    do
    {
        /*these variables need to be reinitialized after each 'y' answer*/
        /*-----------------------------------------------------------------------------------*/
        number = 1;
        ansNInt = 0;
        finderChecker=0;
        n=0;
        ans[3]="";
        ansN[3] = "";
        fileNameContainer[SIZE]= "";
        fileNum[SIZE] = "";
        /*-----------------------------------------------------------------------------------*/
        directory = opendir("C:\\Users\\USER\\Downloads\\");//opening the targeted folder
        if(directory == NULL)//always good to check
        {
            printf("error while trying to open this directory");
            exit(-1);
        }
        do
        {
            printf("enter the name of the file you want to look for : ");
            fgets(entery , sizeof(entery) , stdin);
        /*the fgets function prints in addition to the carateres needed the \n which is a pain
        in the ass so the following function removes the extra \n*/
            nEraser(entery);
            lenght = (int)strlen(entery);
            if(lenght < 3)
            {
                printf("please enter a name that contains more than 3 caracters \n");
                n++;
            }
            if(n == 5)
            {
                printf("you don't want to enter a valid name ? bye then ");
                exit(1);
            }
        }
        while(lenght < 3);
 
        while((theFile = readdir(directory)) != NULL)//reading the fileNameContainer while there is something to read
        {
            strcpy(fileNameContainer,theFile->d_name);//copy the fileNameContainer name to fileNameContainer because its easier to deal with
            /*changing the name of the file to lower case so that it maches the name entered by the user*/
            for(i=0 ; fileNameContainer[i] != '\0' ; i++)
                fileNameContainer[i] = tolower(fileNameContainer[i]);
            /*this is where all the magic happens*/
            if((chrRes = strstr(fileNameContainer,entery)) != NULL)
            {
                printf("%d- \" %s \"\n", number , fileNameContainer);
                finderChecker++;
                number++;
            }
        }
        /*in case there is a match*/
        if(finderChecker != 0)
        {
            printf("\n%d results in total\n\n" , finderChecker);
            printf("what file do you want to modify , choose a number : ");
            fgets(fileNum , sizeof(fileNum) , stdin);
            nEraser(fileNum);
            fileNumInt = strtol(fileNum , NULL , 10);
            printf("what do you want to do with this files ?\n");
            printf("1.rename\n2.remove\n3.nothing I just want to get the hell out of here\n");
            fgets(ansN , sizeof(ansN) , stdin);
            nEraser(ansN);
            ansNInt = strtol(ansN , NULL , 10);
            cases(entery , ansNInt , fileNumInt);
            printf("would you like to perform another search ? y/n ");
            fgets(ans , sizeof(ans) , stdin);
            nEraser(ans);
            if(strcmp(ans,"n") == 0 || strcmp(ans,"N") == 0)
                break;
        }
        else
        {
            printf("we were unable to find this file , would you like to make another search ? y/n ");
            fgets(ans , sizeof(ans) , stdin);
            nEraser(ans);
        }
 
        if(closedir(directory) == -1)
            exit(-2);
    }
    while(strcmp(ans,"y") == 0 || strcmp(ans,"Y") == 0);
    getchar();
    return 0;
}
 
void nEraser(char expression[])
{
    int i , lenght = strlen(expression);
    for(i=0 ; i<lenght ; i++)
    {
        if(expression[i] == '\n')
            expression[i] = '\0';
    }
}
void cases(char entery[] ,int ans , int ansN)
{
    //---------------------------------------------------------------------------------------------------------------------------------
    int i , number = 0;
    struct dirent* filename = NULL;
    DIR* directory = NULL;
    char  *chrRes = NULL , fileNameContainer[SIZE] , Path[SIZE] = "C:\\Users\\USER\\Downloads\\" , newFileName[SIZE] , removeAns[3];
    //---------------------------------------------------------------------------------------------------------------------------------
    directory = opendir(Path);
        if(directory == NULL)//always good to check
        {
            printf("error while trying to open this directory");
            exit(-1);
        }
        while((filename = readdir(directory)) != NULL)//reading the fileNameContainer while there is something to read
        {
            strcpy(fileNameContainer , filename->d_name);//copy the fileNameContainer name to fileNameContainer because its easier to deal with
            for(i=0 ; fileNameContainer[i] != '\0' ; i++)      
                fileNameContainer[i] = tolower(fileNameContainer[i]);
            chrRes = strstr(fileNameContainer,entery);
            if(chrRes != NULL)
            {
                number++;
            }
            if(number == ansN)
                break;
        }
    switch(ans)
    {
        case 1:
            printf("what's the new file name ? : ");
            fgets(newFileName , sizeof(newFileName) , stdin);
            nEraser(newFileName);
            strcat(Path , filename->d_name);
            if(rename(Path, newFileName) == 0)
                printf("the file %s (PATH : %s )was renamed successfuly , the new name is : %s\n" , filename->d_name , Path , newFileName);
            else
                printf("the renaming process didn't go well ...\n");
            break;
        case 2:
            printf("are you sure you want to remove the file : %s ? y/n \n" , filename->d_name);
            fgets(removeAns , sizeof(removeAns) , stdin);
            nEraser(removeAns);
            if(strcmp(removeAns , "y") == 0 || strcmp(removeAns , "Y") == 0)
            {
                strcat(Path , filename->d_name);
                remove(Path);
            }
            break;
        case 3:
            break;
        default :
            printf("please enter a valid answer");
    }
    if(closedir(directory) == -1)
        exit(-3);
}

I've made a program that goes through your download directory (or any other directory you just have to change the path) and finds the files that matches your query then asks you to rename or remove the file of your choice. here is the code : http://pastebin.com/g6Gc5MLx

I've made a program that goes through your download directory (or any other directory you just have to change the path) and finds the files that matches your query then asks you to rename or remove the file of your choice. here is the working code :

#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#define SIZE 100
void nEraser(char expression[]);
void cases(char entery[] ,int ans ,int ansN);
 
int main(void)
{
     //DECLARATIONS
    //----------------------------------------------------------------------------------------------
    char fileNameContainer[SIZE] , entery[SIZE] , ans[3] , ansN[3] , *chrRes = NULL , fileNum[SIZE];
    int i , finderChecker = 0 , lenght = 0 , n = 0 , number = 1 , ansNInt =0 , fileNumInt = 0  ;
    DIR* directory = NULL;
    struct dirent* theFile = NULL;
    //----------------------------------------------------------------------------------------------
    do
    {
        /*these files need to be reinitialized after each 'y' answer*/
        /*-----------------------------------------------------------------------------------*/
        number = 1;
        ansNInt = 0;
        finderChecker=0;
        n=0;
        ans[3]="";
        ansN[3] = "";
        fileNameContainer[SIZE]= "";
        fileNum[SIZE] = "";
        /*-----------------------------------------------------------------------------------*/
        directory = opendir("C:\\Users\\USER\\Downloads\\");//opening the targeted folder
        if(directory == NULL)//always good to check
        {
            printf("error while trying to open this directory");
            exit(-1);
        }
        do
        {
            printf("enter the name of the file you want to look for : ");
            fgets(entery , sizeof(entery) , stdin);
        /*the fgets function prints in addition to the carateres needed the \n which is a pain
        in the ass so the following function removes the extra \n*/
            nEraser(entery);
            lenght = (int)strlen(entery);
            if(lenght < 3)
            {
                printf("please enter a name that contains more than 3 caracters \n");
                n++;
            }
            if(n == 5)
            {
                printf("you don't want to enter a valid name ? bye then ");
                exit(1);
            }
        }
        while(lenght < 3);
 
        while((theFile = readdir(directory)) != NULL)//reading the fileNameContainer while there is something to read
        {
            strcpy(fileNameContainer,theFile->d_name);//copy the fileNameContainer name to fileNameContainer because its easier to deal with
            /*changing the name of the file to lower case so that it maches the name entered by the user*/
            for(i=0 ; fileNameContainer[i] != '\0' ; i++)
                fileNameContainer[i] = tolower(fileNameContainer[i]);
            /*this is where all the magic happens*/
            if((chrRes = strstr(fileNameContainer,entery)) != NULL)
            {
                printf("%d- \" %s \"\n", number , fileNameContainer);
                finderChecker++;
                number++;
            }
        }
        /*in case there is a match*/
        if(finderChecker != 0)
        {
            printf("\n%d results in total\n\n" , finderChecker);
            printf("what file do you want to modify , choose a number : ");
            fgets(fileNum , sizeof(fileNum) , stdin);
            nEraser(fileNum);
            fileNumInt = strtol(fileNum , NULL , 10);
            printf("what do you want to do with this files ?\n");
            printf("1.rename\n2.remove\n3.nothing I just want to get the hell out of here\n");
            fgets(ansN , sizeof(ansN) , stdin);
            nEraser(ansN);
            ansNInt = strtol(ansN , NULL , 10);
            cases(entery , ansNInt , fileNumInt);
            printf("would you like to perform another search ? y/n ");
            fgets(ans , sizeof(ans) , stdin);
            nEraser(ans);
            if(strcmp(ans,"n") == 0 || strcmp(ans,"N") == 0)
                break;
        }
        else
        {
            printf("we were unable to find this file , would you like to make another search ? y/n ");
            fgets(ans , sizeof(ans) , stdin);
            nEraser(ans);
        }
 
        if(closedir(directory) == -1)
            exit(-2);
    }
    while(strcmp(ans,"y") == 0 || strcmp(ans,"Y") == 0);
    getchar();
    return 0;
}
 
void nEraser(char expression[])
{
    int i , lenght = strlen(expression);
    for(i=0 ; i<lenght ; i++)
    {
        if(expression[i] == '\n')
            expression[i] = '\0';
    }
}
void cases(char entery[] ,int ans , int ansN)
{
    //---------------------------------------------------------------------------------------------------------------------------------
    int i , number = 0;
    struct dirent* filename = NULL;
    DIR* directory = NULL;
    char  *chrRes = NULL , fileNameContainer[SIZE] , Path[SIZE] = "C:\\Users\\USER\\Downloads\\" , newFileName[SIZE] , removeAns[3];
    //---------------------------------------------------------------------------------------------------------------------------------
    directory = opendir(Path);
        if(directory == NULL)//always good to check
        {
            printf("error while trying to open this directory");
            exit(-1);
        }
        while((filename = readdir(directory)) != NULL)//reading the fileNameContainer while there is something to read
        {
            strcpy(fileNameContainer , filename->d_name);//copy the fileNameContainer name to fileNameContainer because its easier to deal with
            for(i=0 ; fileNameContainer[i] != '\0' ; i++)      
                fileNameContainer[i] = tolower(fileNameContainer[i]);
            chrRes = strstr(fileNameContainer,entery);
            if(chrRes != NULL)
            {
                number++;
            }
            if(number == ansN)
                break;
        }
    switch(ans)
    {
        case 1:
            printf("what's the new file name ? : ");
            fgets(newFileName , sizeof(newFileName) , stdin);
            nEraser(newFileName);
            strcat(Path , filename->d_name);
            if(rename(Path, newFileName) == 0)
                printf("the file %s (PATH : %s )was renamed successfuly , the new name is : %s\n" , filename->d_name , Path , newFileName);
            else
                printf("the renaming process didn't go well ...\n");
            break;
        case 2:
            printf("are you sure you want to remove the file : %s ? y/n \n" , filename->d_name);
            fgets(removeAns , sizeof(removeAns) , stdin);
            nEraser(removeAns);
            if(strcmp(removeAns , "y") == 0 || strcmp(removeAns , "Y") == 0)
            {
                strcat(Path , filename->d_name);
                remove(Path);
            }
            break;
        case 3:
            break;
        default :
            printf("please enter a valid answer");
    }
    if(closedir(directory) == -1)
        exit(-3);
}