Emacs Lisp Write Function Insertl Takes Three Arguments Atoms New Old List Atoms Builds Li Q37260125

In EMACS Lisp:Write the function insertL which takes three arguments: theatoms new and old, and a list of atoms. It builds a list with newinserted to the left of the first occurrence of old.
Write the function occurN which takes two lists 11 and 12 and counts how many times an atom in 11 occurs in 12 Examples: (occurN ‘(fudge ice cream) ‘(ice cream with fruit for dessert)) returns 2. (occurN ‘(fudge fruit) (ice

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