Ambiguous Grammar and SLR parsing table : No conflicts?
In state 9, you can reduce either $S$ or $S'$, as well as the possible shift action for $e$. So there are both reduce/reduce and shift/reduce conflicts.

The production $S' \rightarrow \epsilon$ cannot be correct; there is already a production $S \rightarrow iCtS$ for an if without an else, so if $S'$ can derive the empty string, $S \rightarrow iCtSS'$ is ambiguous. Once you remove that, you will still have the shift-reduce conflict with $e$. (Since an SLR parser doesn't use lookahead to restrict reduce actions, the entire row for a state with a reduce action must consist of precisely that reduce action. But this particular grammar is ambiguous, so using LALR(1), for example, won't help.)

Finally, $\epsilon$ is not a symbol; it is simply a way of making an empty symbol sequence visible. So it cannot be the head of a column the action table, and also it cannot be on the right hand side of the dot in an item.