readfile.c

#include <stdio.h>
#include <string.h>

char* getConfig(int lineNumber)
{
    // const char fileName[150] = filePath;
    FILE *file;
    file = fopen("config.txt", "r");
    int count = 0;

    if (file != NULL)
    {
        char singleLine[100];
        while (fgets(singleLine, sizeof singleLine, file) != NULL)
        {
            if (count == lineNumber - 1)
            {
                return ("%s", singleLine);
            }
            else
            {
                count++;
            }
        }
    }

    fclose(file);

}

int main(void)
{
    
    const char* myString = getConfig(4);

    printf("%s", myString);
}