Fixed compile error and some typo

CrackingTheCodingInterview/Chapter1ArraysAndStrings/ReplaceSpaces.java

@@ -1,11 +1,11 @@
-// Write a method to replace all spaces in a string with '%20.' You may assum ethat the string
-// has sufficient space at th eend of the string to hold the additional characters, and that you
+// Write a method to replace all spaces in a string with '%20.' You may assume that the string
+// has sufficient space at the end of the string to hold the additional characters, and that you
 // are given the "true" length of the string. (Note: if implementing in Java, please use a characters
 // array so that you can perform this operation in place)
 
 public class ReplaceSpaces {
 	public void replaceSpaces(char[] str, int length) {
-		int spaceCount = 0, newLength; i;
+		int spaceCount = 0, newLength;
 		for(int i = 0; i < length; i++) {
 			if(str[i] == ' ') {
 				spaceCount++;