Please explain line by line what thise code is doing. I do not undestand what push_back is doing in this particular problem. Please comment line by line. Thanks

12. 20 points) You are playing a game. Given an plete word like p_ck, the goal is to provide all [xesitle won ?s lik: Pack, peck pick, or puck that matches the spei itled lettns. You must only privide words fron a dictioary. (This is similar to the gane Hangman.) Write the function match wordshdes this for yau. Assume that the vector dictianary ontains natch vords is this vactor dictionary. The scod input of match ords is the inplete word tac match, an t upecified characters are denoted with the char '_'. The third input of atch vorda is a vector that will contain the matched words after match woras has been call Assume all letters are in lonvercase. So nowod in dictionary contains a capital letter #includ sing std: : string ; using std: vector; using std: cout; using std: enal; void natch worde (const vector ctring dictionary const string partial wd vectork matched-wds? { matched uda.laar; FILL IN HERE nt main) vector tring> dictianary; //laad all vords (but not their dafinitions) from a dictionary //onl t * the ector dictionary vectoratring natches match_worda (dietionary. etring("b i_.t", natches); cout , natche); for size t 1-0 i