Q$4(4$ marks$)$: Suppose that s$1$ and s$2$ are two strings given as follows:

String s$1=$ "Welcome";

String s$2=$ "Welcome to Java and HTML$"$;

a$.$ Write the code that replaces all occurrences of the character $\text{'}e\text{'}$ with $\text{'}E\text{'}$ in s$1$

and assign the new string to $53.$

b$.$ Write the code that splits $s2$ into an array of tokens delimited by a space and

assign this array to s$4.$