From af62069f27f28ef94c961613a68b10aee51f384b Mon Sep 17 00:00:00 2001
From: fdai7057 <julius-philipp.engel@informatik.hs-fulda.de>
Date: Sat, 4 Feb 2023 12:45:20 +0100
Subject: [PATCH] Implementation of function isLetterOfAlphabet().

---
 src/stringManipulation.c | 10 ++++++++++
 src/stringManipulation.h |  1 +
 2 files changed, 11 insertions(+)

diff --git a/src/stringManipulation.c b/src/stringManipulation.c
index 84eea0a..09ebda7 100644
--- a/src/stringManipulation.c
+++ b/src/stringManipulation.c
@@ -79,6 +79,16 @@ bool everyCharacterIsDigit(char *string)
 	return onlyDigits;
 }
 
+bool isLetterOfAlphabet(char *string){
+	bool r = true;
+	for(int i=0;*(string+i)!='\0';++i){
+		if( !(*(string+i)>=65&&*(string+i)<=90) && !(*(string+i)>=97&&*(string+i)<=122)){
+			r = false;
+			break;
+		}
+	}
+	return r;	
+}
 
 unsigned int toUnsignedInteger(char *ID)
 {
diff --git a/src/stringManipulation.h b/src/stringManipulation.h
index 38cf8aa..13bd217 100644
--- a/src/stringManipulation.h
+++ b/src/stringManipulation.h
@@ -10,4 +10,5 @@ char *generateCheckString(unsigned int, char *);
 unsigned int toUnsignedInteger(char *);
 unsigned int power(unsigned int, unsigned int);
 bool everyCharacterIsDigit(char *);
+bool isLetterOfAlphabet(char *);
 #endif