// string-stuff.c includes "string-stuff.h" to make sure that the function
// definitions match the declarations in string-stuff.h.

#include "string-stuff.h"

// These header files are required by the following functions.
// Since this code needs the header files, #include them here.

#include <ctype.h>			// for toupper()
#include <string.h>			// for strlen()

// Copy source to destination, but omit spaces.

void remove_spaces(char to[], const char from[]) {
    char c;
    while ((c = *from++) != '\0')
	if (c != ' ')
	    *to++ = c;
    *to = '\0';
}

// Copy source to destination, but reverse the string.

void reverse(char *destination, const char *source) {
    char *p = destination+strlen(source);
    *p-- = '\0';
    while (*source)
	*p-- = *source++;
    *p = '\0';
}

// Copy src to dst, converting to uppercase.

void uppercase(char *dst, const char *src) {
    do {
    } while ((*dst++ = toupper(*src++)));
}