C command line: get string for file input name, get string for file name output

file in and out name.c

/* Hi all - I am currently a student. The code below was developed during student projects. It may not be the most efficient or robust.
Use it if it's helpful for you. 
-Bill Moriarty
*/
#include <stdio.h>

#define BUF_SIZE 64

/* get the user's input and output filename from the keyboard */
    char inKey[BUF_SIZE];
    char outKey[BUF_SIZE];
    FILE *inFile;
    FILE *outFile;
    
    printf("input filename >");
    fgets(inKey, BUF_SIZE, stdin);
    
    printf("output filename >");
    fgets(outKey, BUF_SIZE, stdin);
    
    /* call method to remove the new line character */
    remove_trailing_space(inKey);
    remove_trailing_space(outKey);
    
    printf("reading '%s' for input\n", inKey);
    printf("writing '%s' for output\n", outKey);
    
    /* check that the files opened correcty */
    if ((inFile=fopen(inKey, "r"))==NULL) {
        printf("error reading %s for input\n", inKey);
        return 1;
    } /* end if */
    
    if ((outFile=fopen(outKey, "w"))==NULL) {
        printf("error reading %s for output\n", outKey);
        return 1;
    } /* end if */

/* a function to remove trailing end of line character*/
void remove_trailing_space(char s[]) {
    int len=strlen(s);
    int i;
    
    i=len-1;
    while (i>=0 && isspace(s[i])) {
        s[i]='\0';
        i--;
    }
} /* end void remove_trailing_space(char s[])  */