Task-1:

Count how many times a string has the letter a

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Task-2:

Count how many times a string has the letter a or A

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Task-3:

Check whether a string contains all the vowels a, e, i, o, u

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Task-4:

If a given string has either x, replace x by y. if the given string has X, replace it by Y.

Hint: You should be able to check whether x or X exists. After that, search online how to replace a character in a string.

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Task-5:

Capitalize Every first Letter of each word in a String