Revert "Create TestCase2.java"

This reverts commit a66a99cb14ab2a00cc68f45c767257bb7a9b24de.
Revert "Create TestCase1.java"

This reverts commit 47ea2de850a01bf8088d5ef2db8308df473e9154.
Revert "Create CosineSimilarity.java"

This reverts commit 4afecaa75576640c93a33d71b9323e313425ec23.