Fixing typos and naming

src/libespeak-ng/dictionary.c

 			p = (char *)(((intptr_t)p+4) & ~3); // advance to next word boundary
 			tr->langopts.replace_chars = (unsigned char *)p;
 
-			// Don't cast to (unsigned int), result may not be garanted depending on compiler
-			while ( !is_str_fully_empty(p, 4) ) {
+			while ( !is_str_totally_null(p, 4) ) {
 				p++;
 			}
 

src/libespeak-ng/readclause.c

 	return CLAUSE_NONE;
 }
 
-int is_str_fully_empty(const char* str, int size) {
-	// Tests if all bytes of str are null uf to size
+int is_str_totally_null(const char* str, int size) {
+	// Tests if all bytes of str are null up to size
 	// This should never be reimplemented with integers, because
 	// this function has to work with unaligned char*
 	// (casting to int when unaligned may result in ungaranteed behaviors)

src/libespeak-ng/readclause.h

 extern PARAM_STACK param_stack[];
 
 // Tests if all bytes of str up to size are null
-int is_str_fully_empty(const char* str, int size);
+int is_str_totally_null(const char* str, int size);
 
 int clause_type_from_codepoint(uint32_t c);
 int towlower2(unsigned int c, Translator *translator); // Supports Turkish I

src/libespeak-ng/translate.c

 static const char *FindReplacementChars(Translator *tr, const char **pfrom, unsigned int c, const char *next, int *ignore_next_n)
 {
 	const char *from = *pfrom;
-	while ( !is_str_fully_empty(from, 4) ) {
+	while ( !is_str_totally_null(from, 4) ) {
 		unsigned int fc = 0; // from character
 		unsigned int nc = c; // next character
 		const char *match_next = next;